Edwin smedley



(No Model.)

E; SMEDLEY.

VERTICAL DRILL.

No. 313,114. Patented Mar. `3, 1885.

UTTED STATES PATnNT Ormea.,

EDWIN SMEDLEY, OF DUBUQUE, IOWA, ASSIGNOR TO THE NATIONAL IROF AND BRASS WORKS, OF SAME PLACE.

VERTICAL DRILL.

SPECIFICATION forming part of Letters Patent No. 313,114, dated March 3I 1885.

.Application filed March 14, 1884. (No model.)

To all whom it may concern.-

Beitknownthat I, EDWIN SMEDLEY, of Dubuque, in the county of Dubuque and State of Iowa, have invented certain new and useful Improvements in Vertical Drills; and I do hereby declare that the following is a full, clear, and exact description of the invention, which will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters of reference marked thereon, which form a part of this specification.

My invention relates to the mechanism 'for allowing a quick return-feed, and will be readily understood from the following description.

In the drawings, Figure l illustrates a side elevation of a vertical drillpress embodying my invention. Fig. 2 is a vertical section through the line o o of Fig. l; Fig. 3, a horizontal section on an enlarged scale through the line y y of Fig. l, and Fig. tan enlarged view of the slide f and its adjacent devices.

Upon bearings in the horizontal bracket l, through which the drll-stock 2 works, is a small shaft, c, having a lever-handle, b, at one of its ends, and an eccentric-pin, c, at its other end, and this pin is permitted a limited range of motion when this shaft is turned by its handle, the pin Vd restricting its movement in one direction, and the pin e restricting it in the other direction,for purposes presently to be stated. This eccentric-pin cworks in a horizontal slot madein a vertically-movable head or slide, f, arranged to move in dovetailed or other guides, g g, which are shown enlarged in Fig. 3. On this slide f is a shaft, h, carrying a worm, z', the end of the' shaft having a Wheel and handle j for operating it. When the handle b is down against the stop d, the eccentric-pin c has passed alittle beyond the upper center, or its highest throw, thus carrying the screw or worm into full gear or engageulentwith the worm-wheel or gear 7c on the shaft l, and which shaft carries a small pinion, m, which engages with the rack m. a is a hand-wheel for actuating this shaft Zand its pinion m when the worm i and the worm-wheel lc are thrown out of engagement with each other.

The operation is as follows: Vhen it is desired to give a powerful but slow feed, the handle Z is brought down against the stop d, as above stated. The eccentricpin c, by means of such action, lifts the slide f and causes the worm z' and its worm-wheel k to engage with each other, and then the operator, by using the hand-wheel j, can produce a very slow feed of the drill, for the worm t' gives but a slow revolution to the wheel k and its shaft, and thus the pinion m gives but a slow movement through the rack m to the drill or bitstock mi. It will also be observed by reference to the lines x :c and fr x in Fig. 4 that when the parts are in the position'shown in that ligure the center of the pin c has passed beyond the vertical line .fr w and reached a point in the line zra. This position serves to keep the pin in its proper place when strain is put upon the screw or worm ,for anystrain then brought on the pin c would only tend to keep the handle b against the stop d, and this is the object of placing the stop d in such a position as that it shall not arrest and hold the handle b until the eccentric shall have passed the center.

Vhen it isdesired to gain or insure a quick return to the drill, the operator merely throws the handle b up until it comes to the stop c. This revolves the shaft c and moves the pin c downward, thus carrying downward also the slide f and the worm or screwc until the latterbecomes disengaged frorn or out of gear with the wornu-gear le. This` sets the gear k and its shaft Z entirely free from any relation to or connection with screw z', and the operator can then effect a quick return of thedrill, as well as an excellent quick feed for light work by means of the hand or lever wheel n.

The other parts illustrated in the drawings need not be particularly described in the present application.

It will be seen that as the eccentricpin c works in a horizontal slot in the slidef it serves positively to lower the worm out of as well as to raise it into engagement with its gear 7c,- that as both journals of the wormshaft h are in the same vertically-sliding piece f their relative positions cannot change, but remain a constant; that as this slide fis held IOO in Vertical parallel guideways it must always move in the same right lines, and that the slide when adjusted holds the worm firmly to its work.

5 I claim- As a means for effecting avariable feed and permitting a quick return-feed in' vertical drills, the sliding head f, constructed as described, and arranged to be moved in xed 1o Vertical guideways g, and provided with two shaft-bearings and a horizontal slot, and having the Worm-shaft supported in said bearings, and having a handled shaft, a, provided with an eccentric-pin working in such slot, these parts being constructed, arranged, and 15 operating,` as and for the purpose set forth. EDWIN SMEDLEY.

Witnesses: i

PAUL TRAUT, JN0. H. Woon. 

